Preferred states of decoherence under intermediate system-environment coupling.
Preferred states of decoherence under intermediate system-environment coupling.
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DOI：
10.1103/physrevlett.108.070403
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发表时间：
2012-01
影响因子：
8.6
通讯作者：
Wen-ge Wang;Lewei He;J. Gong
中科院分区：
文献类型：
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作者：
Wen-ge Wang;Lewei He;J. Gong
退相干迅速减少叠加态的非相干混合的概念隐含地采用了一种特殊的表示，即表示的首选（指针）状态（PS）。对于弱或强的系统-环境相互作用，PS的行为是众所周知的。通过一个简单的动力学模型，模拟了一个两能级系统与其他几个自由度作为其环境相互作用，它表明，即使是中间系统-环境耦合，近似PS仍然可能出现从整个系统的相干量子动力学在没有任何热平均。所发现的PS也可以连续变形到弱或强系统-环境耦合的预期极限。计算结果也定性解释。这一发现将有助于进一步理解退相干和量子热化过程。
The notion that decoherence rapidly reduces a superposition state to an incoherent mixture implicitly adopts a special representation, namely, the representation of preferred (pointer) states (PS). For weak or strong system-envrionment interaction, the behavior of PS is well known. Via a simple dynamical model that simulates a two-level system interacting with few other degrees of freedom as its environment, it is shown that even for intermediate system-environment coupling, approximate PS may still emerge from the coherent quantum dynamics of the whole system in the absence of any thermal averaging. The found PS can also continuously deform to expected limits for weak or strong system-environment coupling. Computational results are also qualitatively explained. The findings should be useful towards further understanding of decoherence and quantum thermalization processes.